Abstract 137 Poster Session III, Monday, 5/3 (poster 144)

In many neonatal LVOTO lesions, the adequacy of the left heart is questionable. However, some LVOTO lesions associated with "hypoplastic" LV's are amenable to biventricular repair. We hypothesized that: 1) pre-operative (preop) LV volume is reduced due to compression by the right ventricle and by underfilling secondary to underlying hemodynamics; 2) preop potential LV volume, which is that volume assumed by the LV in the absence of compression by the right ventricle (J Am Coll Cardiol 1997; 30:1547), can accurately predict post-operative (postop) volume; 3) the "Rhodes criteria" (Circulation 1991; 84:2325